21. The most important thing about cotton in history is _____ part that it played in _____ Industrial Revolution.
A. /; the B. the; / C. the; / D. the; the
22.—It may rain tomorrow. Will the sports meeting be put off?
---No, it will ____whether it rains or not.
A .be put off B. make no difference C. put off D. make any difference
